(a⁢q1k,q⁢ωk⁢a1k,…,q⁢ωkk-1⁢a1k;q)n(a1k,ωk⁢a1k,…,ωkk-1⁢a1k;q)n=(a⁢qk;qk)n(a;qk)n=1-a⁢qk⁢n1-a,